Abstract:
The present invention relates to a method of analysing nucleic acid in a sample comprising:- providing a nucleic acid probe, which is anchored to a substrate surface only from one or more point(s) located in a mid-region of the nucleic acid probe; and detecting the presence or absence of a target nucleic acid sequence in the sample by hybridisation of the nucleic acid probe with the target nucleic acid sequence if present.
Abstract:
A method for determining the number of tandem repeats in a target polynucleotide, the method comprising (a) providing a sample containing the target polynucleotide, wherein one or more of the tandem repeats in the target polynucleotide is in single stranded form, (b) hybridising a labelled probe oligonucleotide to the single stranded portion of the target polynucleotide, wherein the probe oligonucleotide is complementary to at least one of the tandem repeats, and at least 5 nucleotides of the probe oligonucleotide are complementary to the tandem repeats, in the single stranded portion of the target polynucleotide, and (c) determining the number of tandem repeats in the target polynucleotide based on the hybridisation of the probe oligonucleotide to the single stranded portion of the target polynucleotide.
Abstract:
Use of azide/alkyne coupling (click ligation) for oligonucleotide circularisation is proposed for both therapeutic and nanotechnology applications. Such non-templated single-strand circularisation may be the first step in building a more complex catenane by further templated-directed click ligation of olignucleotide sequences, e.g. a double- stranded cyclic oligonucleotide or pseudo-hexagon. Circularisation using click ligation may be used to improve stability of therapeutic oligonucleotides to enzyme degradation in vivo.
Abstract:
There is provided a method of detecting the presence of a target polynucleotide and/or sequence variations within the target polynucleotide using a probe system comprising two independent partner oligonucleotide components wherein the first oligonucleotide has a first and second section, wherein the first section comprises a nucleotide sequence that is labelled with at least one visually detectable label and is not capable of hybridising to the nucleotide sequence of the target polynucleotide; and wherein the second section comprises a nucleotide sequence that is capable of hybridising to a portion of the sequence of the target polynucleotide; and the second oligonucleotide has a first and second section, wherein the first section comprises a nucleotide sequence which is capable of hybridising to a nucleotide sequence of the first section of the first oligonucleotide; and the second section comprises a nucleotide sequence that is capable of hybridising to a nucleotide sequence of the target polynucleotide that is adjacent to the nucleotide sequence that the second section of the first oligonucleotide is capable of hybridising to. There are also provided alternative methods using additional oligonucleotides and probes for use in such methods.
Abstract:
The invention relates to a method of nucleic acid processing comprising: providing an adapted nucleic acid fragment having a triazole linkage therein; and transcribing the adapted nucleic acid fragment with reverse transcriptase. The invention further relates to kits and uses associated with the method.
Abstract:
The present invention relates, in one aspect, to a method for monitoring the dehybridisation of double stranded nucleic acid, comprising the steps of: (a) providing a nucleic acid probe and a target nucleic acid; (b) forming a double stranded nucleic acid of which at least one of the strands of the nucleic acid is in contact with a solid substrate; (c) applying a potential ramp to the solid substrate; and (d) monitoring the dehybridisation of the double stranded nucleic acid across the potential ramp, wherein the nucleic probe is a linear nucleic acid probe and/or the target nucleic acid comprises a label.
Abstract:
A method of purifying and fabricating nanostructures comprises adding to material containing nanostructures of various sizes DNA molecules of a first type that associate only with nanostructures of a certain diameter. The DNA molecules select these nanostructures by forming assemblies with them. The material is then applied to a surface patterned with further DNA molecules that associate with the assemblies, so that the assemblies are immobilised on the surface. AU other material is washed from the surface, leaving only the immobilised assemblies. The nanostructures can then be recovered by dissociating the assemblies from the surface and then disassembling the assemblies to free the nanostructures. Thus nanostructures of one diameter only are separated from the bulk of the material. The immobilising stage can also be used to create desired distributions of same-sized nanostructures on an appropriately patterned surface.